I'm a firefighter, & a bunch of the guys on my department started doing crossfit about 2 years ago. Since then, 2 of them have had knee surgery, 1 a torn rotator cuff/labrum surgery, 3 major back injuries, and I can't count how many sprained ankles. Consequently, my pay has gone up almost 30% the last 2 years due to all the unscheduled overtime I get to work. Crossfit rocks!